Display device including a partition having a stacked structure

Abstract

To improve image quality of a full-color organic EL display panel. A partition has a stacked structure formed using different materials. A lower partition has a curved shape, and an upper partition has a flat top surface. An angle formed between a plane surface connecting a lower end of a side surface with an upper end of the side surface of the upper partition and the top surface of the upper partition is less than or equal to 90°. The height of the partition is controlled to be greater than or equal to 0.5 μm and less than or equal to 1.3 μm. With such a structure, a large color organic EL display panel achieves high-definition display.

What is claimed is: 
     
       1. A display device comprising:
 a first electrode; 
 a first partition overlapping with an end portion of the first electrode; 
 a second partition over and in contact with the first partition; 
 a light-emitting layer over the first electrode and a part of the first partition; and 
 a second electrode over the light-emitting layer, 
 wherein a perpendicular distance between a top surface of the first electrode and a top surface of the second partition is greater than or equal to 0.5 μm and less than or equal to 1.3 μm, and 
 wherein the second partition has a reverse tapered shape. 
 
     
     
       2. The display device according to  claim 1 , further comprising:
 a first substrate having a first surface; 
 a second substrate having a second surface facing the first surface; 
 a color filter layer over the second surface; and 
 a black matrix over the second surface, 
 wherein the first electrode is located over the first surface of the first substrate, and 
 wherein the first partition overlaps with the black matrix. 
 
     
     
       3. The display device according to  claim 2 , wherein a perpendicular distance between a surface of the color filter layer on the first substrate side and the top surface of the first electrode is less than or equal to 3 μm. 
     
     
       4. The display device according to  claim 1 , wherein the first partition has a curved top surface. 
     
     
       5. The display device according to  claim 1 , further comprising a transparent conductive layer over and in contact with the first electrode. 
     
     
       6. The display device according to  claim 5 , wherein the transparent conductive layer has a stacked structure. 
     
     
       7. The display device according to  claim 1 , wherein a length in a direction of a long side of the top surface of the second partition is larger than or equal to a length in a direction of a long side of the first electrode. 
     
     
       8. The display device according to  claim 1 , wherein the first partition comprises a colored organic insulating material. 
     
     
       9. The display device according to  claim 1 , wherein the second partition comprises a colored organic insulating material. 
     
     
       10. The display device according to  claim 1 , wherein the second partition is located only between pixels of different colors. 
     
     
       11. The display device according to  claim 1 , further comprising a third partition between pixels of the same color,
 wherein the second partition is located between pixels of different colors, and 
 wherein a material of the third partition is same as a material of the second partition. 
 
     
     
       12. A display device comprising:
 a first pixel and a second pixel adjacent to the first pixel, each of the first pixel and the second pixel comprising:
 a first electrode; and 
 a light-emitting layer over the first electrode; 
 
 a first partition overlapping with an end portion of the first electrode of the first pixel and an end portion of the first electrode of the second pixel; and 
 a second partition being over and in contact with the first partition, and between the first electrode of the first pixel and the first electrode of the second pixel, 
 wherein a perpendicular distance between a top surface of the first electrode and a top surface of the second partition is greater than or equal to 0.5 μm and less than or equal to 1.3 μm, and 
 wherein the second partition has a reverse tapered shape. 
 
     
     
       13. The display device according to  claim 12 , further comprising:
 a first substrate having a first surface: 
 a second substrate having a second surface facing the first surface; 
 a color filter layer over the second surface; and 
 a black matrix over the second surface, 
 wherein the first electrode of the first pixel and the first electrode of the second pixel are located over the first surface, and 
 wherein the first partition overlaps with the black matrix. 
 
     
     
       14. The display device according to  claim 13 , wherein a perpendicular distance between a surface of the color filter layer on the first substrate side and the top surface of the first electrode is less than or equal to 3 μm. 
     
     
       15. The display device according to  claim 12 , wherein the first partition has a curved top surface. 
     
     
       16. The display device according to  claim 12 , further comprising a transparent conductive layer over and in contact with the first electrode. 
     
     
       17. The display device according to  claim 16 , wherein the transparent conductive layer has a stacked structure. 
     
     
       18. The display device according to  claim 12 , wherein a length in a direction of a short side of the top surface of the second partition is smaller than or equal to a distance between the first electrode of the first pixel and the first electrode of the second pixel. 
     
     
       19. The display device according to  claim 12 , wherein a length in a direction of a long side of the top surface of the second partition is larger than or equal to a length in a direction of a long side of the first electrode. 
     
     
       20. The display device according to  claim 12 , wherein the first partition comprises a colored organic insulating material. 
     
     
       21. The display device according to  claim 12 , wherein the second partition comprises a colored organic insulating material. 
     
     
       22. The display device according to  claim 12 , wherein a color of the first pixel is different from a color of the second pixel. 
     
     
       23. The display device according to  claim 12 , further comprising:
 a third pixel adjacent to the first pixel, the third pixel including the first electrode and the light-emitting layer; and 
 a third partition between the first pixel and the third pixel, 
 wherein a material of the third partition is same as a material of the second partition, 
 wherein the second partition is located between the first pixel and the second pixel, 
 wherein a color of the first pixel is different from a color of the second pixel, and 
 wherein a color of the third pixel is same as the color of the first pixel.